400231000 has 128 divisors (see below), whose sum is σ = 1068500160. Its totient is φ = 139008000.

The previous prime is 400230997. The next prime is 400231009. The reversal of 400231000 is 132004.

It is a super-2 number, since 2×400231000² = 320369706722000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400231009) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 220095 + ... + 221905.

Almost surely, 2^400231000 is an apocalyptic number.

400231000 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400231000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (534250080).

400231000 is an abundant number, since it is smaller than the sum of its proper divisors (668269160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400231000 is a wasteful number, since it uses less digits than its factorization.

400231000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1862 (or 1848 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 400231000 is about 20005.7741664750. The cubic root of 400231000 is about 736.9481076463.

Adding to 400231000 its reverse (132004), we get a palindrome (400363004).

The spelling of 400231000 in words is "four hundred million, two hundred thirty-one thousand".